Infraspinatus Muscle Anatomy and Tendinous Structure
1. Overview of Muscle Architecture
- The infraspinatus muscle consists of two distinct portions:
- These portions are connected at the superior muscular area but clearly separate in the distal tendinous region.
2. Tendinous Characteristics
- The tendinous portion is primarily derived from the oblique part:
3. Distinctive Attachments
- The oblique part attaches directly to the greater tuberosity.
- The transverse part:
4. Functional Insight
- The oblique portion contributes to the majority of the muscle's functional tendon, while the transverse portion plays a supportive role.
#Infraspinatus, #ShoulderAnatomy, #MuscleArchitecture, #RotatorCuff, #ObliquePortion, #TransversePortion, #TendonStructure, #GreaterTuberosity, #ShoulderMRI, #OrthopedicImaging
References
- Surg Radiol Anat. 2012 Apr;34(3):257-65.
Novel Lesions of the Infraspinatus Tendon
1. Definition of Novel Lesions
- Novel lesions in the infraspinatus tendon present as edema detected on MRI, extending from the distal tendon to the myotendinous junction.
- These lesions are linked to delamination injuries with differential retraction of the transverse and oblique tendon components.
2. Surgical and MRI Insights
- Referred to as the "novel lesion of the infraspinatus" in surgical literature.
- Lesions may be occult on arthroscopy if:
3. Clinical Significance
- Delamination of the musculotendinous junction can complicate diagnosis due to its subtle presentation on imaging and arthroscopy.
#InfraspinatusLesion, #RotatorCuff, #MRIFindings, #TissueDelamination, #MyotendinousJunction, #ShoulderImaging, #OrthopedicRadiology, #DelaminationInjury, #InfraspinatusTendon, #DiagnosticChallenges
References
- MRI Web Clinic — June 2021: Tissue Delamination Radsource
- MRI Web Clinic — February 2013: Rotator Cuff Pitfalls by Mark H. Awh, M.D. Radsource
